Welcome, the Old Town canoe with serial number 159051 is an 18 foot long, AA (or top) grade, Guide model with a keel, and a floor rack. It was built between December, 1952 and February, 1953. The original exterior paint color was dark green. It shipped on March 31st, 1953 to Lyons, Illinois. A scan showing this build record can be found below.
This scan and several hundred thousand others were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others. A description of the project to preserve these records is available at http://www.wcha.org/catalogs/old-town/records/ if you want more details. I hope that you will donate, join or renew your membership to the WCHA so that services like this can continue. See http://www.wcha.org/about-wcha to learn more about the WCHA and https://www.woodencanoe.org/pricing-plans/join to donate or renew.
It is also possible that you could have another number or manufacturer this description doesn't match the canoe. Feel free to reply here if you have any other questions.